with this function

<script type="text/javascript">
function ajaxcall(div, page)
{
if (window.XMLHttpRequest)
  {xmlhttp=new XMLHttpRequest();}
else
  { xmlhttp=new ActiveXObject("Microsoft.XMLHTTP"); }
xmlhttp.onreadystatechange=function()
  {
  if (xmlhttp.readyState==4 && xmlhttp.status==200)
    {
    document.getElementById(div).innerHTML=xmlhttp.responseText;
    }
  }
xmlhttp.open("GET",page,true);
xmlhttp.send();
}
</script>

i use my ajax. But in the page i call 2 times this function:

<script type="text/javascript">ajaxcall("menu", "perfil.php");</script> 
<script type="text/javascript">ajaxcall('mapadiv', "map2.php");</script>

But happens that only one of them works, if i remove one the other works. What im doing wrong? Thanks!